Blade-mounting.



H. T. HERE.

BLADE MOUNTING.

APPLIUATION FILED JAN. 30, 1913. l 1,072,457, Patented Sept. 9, 1913.

2 BEETSSHEET l.

W S 3W Mam By M CDLUMDAA PLANOUKMPM cm, wasnm nnnnnnnn ent re sratrns mire n'r orricic HERBERT T. HERB, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE MACHINE COMPANY, A CORPORATION OF PENNSYLVANIA.

BLADE-MOUNTING.

Specification of Letters Patent.

Patented Sept. 9, 1913.

Application filed January 30, 1912. Serial No. 674,293.

To all whom it may concern Be it known that I, Ilnnnnn'r T. IIERR, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have made a new and useful Invention in BladeaMoiintings, of which the following is a specification.

This invention relates to turbine blade mounting means and more particularly to mounting means for impulse blades.

One of the objects of the invention is to provide means for securely fastening the blades to the blat'le-ho-lding element so that the liability of the blades becoming loose, on account of hydraulic friction or contrifugal stresses due to the relatively high speeds at which turbines of this class are run, will be reduced.

In the drawings: Figure 1 is a fragmentary perspective view of a turbine element constructed in accordance with my invention to which the blades are attached. Fig. 2 is a cross-sectional view of a portion of a blade-holding element carrying blades. Fig. 3 is a vertical sectional view through a portion of the blade-holding element to which the blades are attached; and Fig. 4 is a detail perspective view of one cat the blades.

Referring now to the drawings by numorals of reference, 10 designates a bladeholding element here shown as an impulse wheel which is provided with the flanges 11 and 12 each of which is adapted to carry a row of impulse blades. Inasmuch as the fastening means for the two rows of blades may be identical, only one row and its fastening means will be described and reference will be had to the flange 12 and the blades carried thereby for this purpose. The flange 12 as illustrated is provided with a plurality of radial slots 13 cut through from the outer surface 1 1 to the inner surface 15 of the flange. Two rows of bendable projections extend laterally from the face of the flange 12. The outer row 16 lies slightly below the outer surface Ll. The inner row 17 is adjacent to the inner surface of the flange 12 and the projections 17 are notched as indicated at 18 (see Fig. 1). The projections 16 are adapted to receive and hold in place a removable strip 19 which is here shown as being wedge-shape in cross section. The n'ojections 17 are adapted to receive a rod or wire 20 in the notches 18 to hold the blades in place.

The specific consti-ucthm of the preferred form of blade is best illustrated in Fig. 1 in which I have shown a blade comprising a concave-convex portion 21 having a ter minal projection 22 to receive a shroud 23 which may be attached thereto in the usual manner. The concavo-convex portion 21 of the blade is carried by a shank 21 which is here shown rectangular in cross section and which is provided with a T-hcad 9 1.

In applying the blades they may be secured to the blade-carrying element 10 by inserting the shanks 21 in the slots 13 so that the T-heads rest against the inner surtace of the flange. The strip 19 may then be placed upon the projection 16 and by upsetting the projections or tapping them so that their upper faces 25 will fit snugly against the inclined face 26 Of the strip 19, the strip will be held against lateral displacement and in turn will hold the shanks in place, inasmuch as the strip bridges the slots in which the shanks lie. The rod or wire or other similar device may be inserted in the notches 18 and by slightly bending the terminals of the projections to grip the wire, the shanks will be additionally held against lateral displacement. .l tadial dis placement of the blades is prevented by the T-heads 241.

Ilaving thus described my invention, what I claim is:

1. A blade-holding element provided with slots, blades in said slots, and blade-securing means comprising a member bridging said slots and flush with the outer edge of the blade-holding element. and means on the blade-holding element for engaging said means.

9.. A blade-holding element provided with slots, blades in said slots, and blade-securing means comprising removable members spaced apart and bridging said slots, and bendable lingers cast on the side oi. the blade-holding element and bendable in opposite directions to engage said removable members.

3. A blade-holding element comprising a subscribed my name this 29th day of Janunlrheel progided with slots, blades in the ary, 1912. s ots, and lade-securing means comprisin a member bridging the said slots and flush HERBERT HERE 5 With the periphery of the Wheel, and means Witnesses:

on the Wheel for engaging said means. C. W. MCGHIEE,

In testimony whereof, I have hereunto ADA ROMIG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

